﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;
using System.Device.Location;
using System.IO.IsolatedStorage;
using System.IO;
using System.Threading;

namespace PERenaud
{
    public partial class App : Application
    {
        /// <summary>
        /// Provides easy access to the root frame of the Phone Application.
        /// </summary>
        /// <returns>The root frame of the Phone Application.</returns>
        public PhoneApplicationFrame RootFrame { get; private set; }

        //The contact which is currently followed/edited
        public static Friend currentFriend;

        // A static bool to keep track of whether data acquisition is running or not.
        public static bool running = false;

        // Hard coded array for emulated status values
        public static GeoPositionStatus[] emulatedStatusValues = { GeoPositionStatus.Initializing, GeoPositionStatus.Ready };
        // Delay after each emulated status value in the array above. These two arrays should be the same length.
        public static int[] emulatedStatusDelay = { 1000, 1000 };


        public static bool emulationMode;

        /// <summary>
        /// Constructor for the Application object.
        /// </summary>
        public App()
        {
            // Global handler for uncaught exceptions. 
            UnhandledException += Application_UnhandledException;

            // Show graphics profiling information while debugging.
            if (System.Diagnostics.Debugger.IsAttached)
            {
                // Display the current frame rate counters.
                Application.Current.Host.Settings.EnableFrameRateCounter = true;

                // Show the areas of the app that are being redrawn in each frame.
                //Application.Current.Host.Settings.EnableRedrawRegions = true;

                // Enable non-production analysis visualization mode, 
                // which shows areas of a page that are being GPU accelerated with a colored overlay.
                //Application.Current.Host.Settings.EnableCacheVisualization = true;
            }
            emulationMode = false;

            // Standard Silverlight initialization
            InitializeComponent();

            // Phone-specific initialization
            InitializePhoneApplication();
        }

        // Code to execute when the application is launching (eg, from Start)
        // This code will not execute when the application is reactivated
        private void Application_Launching(object sender, LaunchingEventArgs e)
        {
        }

        // Code to execute when the application is activated (brought to foreground)
        // This code will not execute when the application is first launched
        private void Application_Activated(object sender, ActivatedEventArgs e)
        {
        }

        // Code to execute when the application is deactivated (sent to background)
        // This code will not execute when the application is closing
        private void Application_Deactivated(object sender, DeactivatedEventArgs e)
        {
        }

        // Code to execute when the application is closing (eg, user hit Back)
        // This code will not execute when the application is deactivated
        private void Application_Closing(object sender, ClosingEventArgs e)
        {
        }

        // Code to execute if a navigation fails
        private void RootFrame_NavigationFailed(object sender, NavigationFailedEventArgs e)
        {
            if (System.Diagnostics.Debugger.IsAttached)
            {
                // A navigation has failed; break into the debugger
                System.Diagnostics.Debugger.Break();
            }
        }

        // Code to execute on Unhandled Exceptions
        private void Application_UnhandledException(object sender, ApplicationUnhandledExceptionEventArgs e)
        {
            if (System.Diagnostics.Debugger.IsAttached)
            {
                // An unhandled exception has occurred; break into the debugger
                System.Diagnostics.Debugger.Break();
            }
        }

        /// <summary>
        /// Returns the status values defined in the emulatedStatusValues variable and
        /// then sleeps for the amount of time specified in the emulatedStatusDelay variable
        /// </summary>
        /// <returns></returns>
        public static IEnumerable<GeoPositionStatusChangedEventArgs> EmulateStatusEvents()
        {
            // Loop over the emulated status values until the end of the list
            for (int i = 0; i < emulatedStatusValues.Length; i++)
            {

                // return the current status value
                yield return new GeoPositionStatusChangedEventArgs(emulatedStatusValues[i]);

                // sleep for the specified delay for each status value in the array
                Thread.Sleep(emulatedStatusDelay[i]);

                // Break out of the loop if running is turned off
                if (!running)
                {
                    break;
                }
            }

        }


        /// <summary>
        /// This method is called when location emulation is started. It first attempts to read the file
        /// that users can save in isolated storage. If that file doesn't exist, the resource file packaged
        /// with the application is used, LocationData.txt in the Solution Explorer ---->
        /// </summary>
        /// <returns></returns>
        public static List<GeoCoordinate> ReadLocationDataFile()
        {
            // Initialize the coordinate list
            var coordinates = new List<GeoCoordinate>();

            // Open the isolated storage file
            IsolatedStorageFile isoStore = IsolatedStorageFile.GetUserStoreForApplication();

            Stream dataFileStream = null;

            // First, check for a file in isolated storage
            if (isoStore.FileExists("LocationData.txt"))
            {
                dataFileStream = new IsolatedStorageFileStream("LocationData.txt", FileMode.OpenOrCreate, isoStore);
            }
            else
            {
                // If there is no file in isolated storage, use the resource file
                Uri resourceUri = new Uri("/PERenaud;component/LocationData.txt", UriKind.Relative);
                System.Windows.Resources.StreamResourceInfo resourceInfo = Application.GetResourceStream(resourceUri);
                dataFileStream = resourceInfo.Stream;
            }

            // read the file and add the coordinates to the list
            using (StreamReader sr = new StreamReader(dataFileStream))
            {
                while (!sr.EndOfStream)
                {
                    string[] latlong = sr.ReadLine().Split(',');
                    coordinates.Add(new GeoCoordinate(Double.Parse(latlong[0]), Double.Parse(latlong[1])));
                }
                sr.Close();
            }
            return coordinates;
        }

        public static IEnumerable<GeoCoordinate> EmulatePositionEvents()
        {
            // Get a list of coordinates from a data file
            var coordinates = App.ReadLocationDataFile();

            // Loop through all of the coordinates
            int index = 0;
            for (; ; )
            {

                // Sleep for a moment. You can adjust this to change the rate at which the events fire
                Thread.Sleep(200);

                // Return the next coordinate in the list
                yield return coordinates[index];



                // Increment the array index
                index = (index + 1) % coordinates.Count;

                // Break out of the loop if running is turned off
                if (!App.running)
                {
                    break;
                }
            }
        }

        #region Phone application initialization

        // Avoid double-initialization
        private bool phoneApplicationInitialized = false;

        // Do not add any additional code to this method
        private void InitializePhoneApplication()
        {
            if (phoneApplicationInitialized)
                return;

            // Create the frame but don't set it as RootVisual yet; this allows the splash
            // screen to remain active until the application is ready to render.
            RootFrame = new PhoneApplicationFrame();
            RootFrame.Navigated += CompleteInitializePhoneApplication;

            // Handle navigation failures
            RootFrame.NavigationFailed += RootFrame_NavigationFailed;

            // Ensure we don't initialize again
            phoneApplicationInitialized = true;
        }

        // Do not add any additional code to this method
        private void CompleteInitializePhoneApplication(object sender, NavigationEventArgs e)
        {
            // Set the root visual to allow the application to render
            if (RootVisual != RootFrame)
                RootVisual = RootFrame;

            // Remove this handler since it is no longer needed
            RootFrame.Navigated -= CompleteInitializePhoneApplication;
        }

        #endregion
    }
}